Double-sided receipt printing method and double-sided receipt printer

Abstract

A first printhead that prints on one side of the paper, a second printhead that prints on the other side of the paper, and a cutter are disposed to the paper conveyance path with a specific gap therebetween approaching the paper exit for the paper, and a conveyance unit that conveys the paper through the conveyance path in a device that prints duplex receipts. Based on reception of a transaction end statement, the printer prints part of the transaction information by the first printhead; prints the remaining part of the transaction information by the second printhead; prints store information, the length of which fits between the cutter and the first printhead, by the first printhead after printing the transaction information; and then cuts the paper by the cutter at a position between the area where the transaction information was printed and the area where the store information was printed.

What is claimed is: 
     
       1. A double-sided receipt printer configured to print transaction information and store information on paper, comprising:
 a conveyance unit configured to convey the paper to a conveyance direction; 
 a first printhead configured to print on a first side of the paper; 
 a second printhead configured to print on a second side of the paper printed by the first printhead; 
 a cutter configured to cut the paper printed by the first printhead and the second printhead; 
 a paper exit for the paper; 
 a storage unit configured to store the store information, a length of which in the conveyance direction is less than or equal to a distance between the cutter and the first printhead; and 
 a controller configured to control printing the store information and a first part of the transaction information followed by the store information on the first side of the paper by the first printhead and printing a second part of the transaction information by the second printhead. 
 
     
     
       2. The double-sided receipt printer described in  claim 1 , further comprising:
 a data allocation unit configured to divide the transaction information to the first part and the second part. 
 
     
     
       3. The double-sided receipt printer described in  claim 2 , wherein
 a length of the second part is greater than a length of the first part. 
 
     
     
       4. The double-sided receipt printer described in  claim 3 , Wherein
 a difference of the length of the first. part and the length of the second part is equal to a distance between the first printhead and the second printhead. 
 
     
     
       5. A P 0 S system including a POS terminal and a double-sided receipt printer comprising:
 the POS terminal configured to send transaction information; and 
 the double-side receipt printer including:
 a conveyance unit configured. to convey paper to a conveyance direction; 
 a first printhead configured to print on a first side of the paper; 
 a second printhead configured to print on a second side of the paper printed by the first printhead; 
 a cutter configured to cut the paper printed by the first printhead and the second printhead; 
 paper exit for the paper; 
 a storage unit configured to store the store information, a length of which in the conveyance direction is less than or equal to a distance between the cutter and the first printhead; and 
 a controller configured to control printing the store information and a first part of the transaction information followed by the store information on the first side of the paper by the first printhead and printing a second part of the transaction information by the second printhead. 
 
 
     
     
       6. The POS system described in  claim 5 , further comprising:
 The double-sided receipt printer includes a data allocation unit configured to divide the transaction information to the first part and the second part. 
 
     
     
       7. The POS system described in  claim 6 , wherein
 a length of the second part is greater than a length of the first part. 
 
     
     
       8. The POS system described in  claim 7 , wherein
 a difference of the length of the first part and the length of the second part is equal to a distance between the first printhead and the second printhead.